In Australia ,he made a lot of friends ___a very practical know
题目
In Australia ,he made a lot of friends ___a very practical know
答案
In Australia he made a lot of friends _B_ a very useful knowledge of the English language.
A get B to get C getting D got 将useful改成practical：在澳大利亚他为了掌握实用的英语交了很多朋友.
举一反三
已知函数f（x）=x，g（x）=alnx，a∈R．若曲线y=f（x）与曲线y=g（x）相交，且在交点处有相同的切线，求a的值和该切线方程．
我想写一篇关于奥巴马的演讲的文章,写哪一篇好呢?为什么好
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